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President Obama arrived in Kenya Friday for a two-day visit, before heading to Ethiopia on Sunday. He's been outspoken in his criticism of Kenya when it comes to the way the country treats gay people, but are his words making any difference? Plus, after three decades, a vaccine against malaria has been approved for use. But critics say its only 30 percent effective, and there are concerns that it may prove too expensive for many of those afflicted to afford. And, Republican presidential candidate Donald Trump caused a big stir when he took his show on the road to the US-Mexico border. We check in with a Mexican journalist and activist to learn how that went down on the Mexican side.

Malaria kills hundreds of thousands of people each year but this may be about to change. The first malaria vaccine had been approved by the European Medicines Agency. David Kaslow, Path vice president, talks about the impact of this vaccine.

Presidential candidate Donald Trump hates undocumented immigrants. He says they bring crime and disease into the country, and he wants a giant wall built the length of the border. So how's all this going over, south of the border?

After visiting Kenya, President Obama will turn his attention to another country in the Horn of Africa: Ethiopia. But human rights campaigners argue that Ethiopia is "not a model of democracy that should be rewarded with a presidential visit."